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Question 19 (5 points) In Haskell, the less-than function, a->a-> Bool In three sentences or less, briefly explain what this type means Question 20 (4 points) Given a two element list with numbers 2 and 3 Give two examples (one in Haskell and one in Prolog) that defines the previous list and uses a "cons" operator to add the digit 1 to the head of this list. Question 21 (4 points) What are the four components (i.e. parts) of a formal phrase structure grammar? Question 22 (3 points) In a sentence or two, why is "dangling else" an important problem to study in a Principles of Programming Language coursel